// @ts-nocheck
import { sequentialize } from "@grammyjs/runner";
import { apiThrottler } from "@grammyjs/transformer-throttler";
import type { ApiClientOptions } from "grammy";
import { Bot, webhookCallback } from "grammy";
import { resolveDefaultAgentId } from "../agents/agent-scope.js";
import { resolveTextChunkLimit } from "../auto-reply/chunk.js";
import { DEFAULT_GROUP_HISTORY_LIMIT, type HistoryEntry } from "../auto-reply/reply/history.js";
import {
  isNativeCommandsExplicitlyDisabled,
  resolveNativeCommandsEnabled,
} from "../config/commands.js";
import type { ClawdbotConfig, ReplyToMode } from "../config/config.js";
import { loadConfig } from "../config/config.js";
import {
  resolveChannelGroupPolicy,
  resolveChannelGroupRequireMention,
} from "../config/group-policy.js";
import { loadSessionStore, resolveStorePath } from "../config/sessions.js";
import { logVerbose, shouldLogVerbose } from "../globals.js";
import { getChildLogger } from "../logging.js";
import type { RuntimeEnv } from "../runtime.js";
import { resolveTelegramAccount } from "./accounts.js";
import { resolveTelegramForumThreadId, resolveTelegramStreamMode } from "./bot/helpers.js";
import type { TelegramContext, TelegramMessage } from "./bot/types.js";
import { registerTelegramHandlers } from "./bot-handlers.js";
import { createTelegramMessageProcessor } from "./bot-message.js";
import { registerTelegramNativeCommands } from "./bot-native-commands.js";
import {
  buildTelegramUpdateKey,
  createTelegramUpdateDedupe,
  resolveTelegramUpdateId,
  type TelegramUpdateKeyContext,
} from "./bot-updates.js";
import { resolveTelegramFetch } from "./fetch.js";

export type TelegramBotOptions = {
  token: string;
  accountId?: string;
  runtime?: RuntimeEnv;
  requireMention?: boolean;
  allowFrom?: Array<string | number>;
  groupAllowFrom?: Array<string | number>;
  mediaMaxMb?: number;
  replyToMode?: ReplyToMode;
  proxyFetch?: typeof fetch;
  config?: ClawdbotConfig;
  updateOffset?: {
    lastUpdateId?: number | null;
    onUpdateId?: (updateId: number) => void | Promise<void>;
  };
};

export function getTelegramSequentialKey(ctx: {
  chat?: { id?: number };
  message?: TelegramMessage;
  update?: {
    message?: TelegramMessage;
    edited_message?: TelegramMessage;
    callback_query?: { message?: TelegramMessage };
  };
}): string {
  const msg =
    ctx.message ??
    ctx.update?.message ??
    ctx.update?.edited_message ??
    ctx.update?.callback_query?.message;
  const chatId = msg?.chat?.id ?? ctx.chat?.id;
  const isForum = (msg?.chat as { is_forum?: boolean } | undefined)?.is_forum;
  const threadId = resolveTelegramForumThreadId({
    isForum,
    messageThreadId: msg?.message_thread_id,
  });
  if (typeof chatId === "number") {
    return threadId != null ? `telegram:${chatId}:topic:${threadId}` : `telegram:${chatId}`;
  }
  return "telegram:unknown";
}

export function createTelegramBot(opts: TelegramBotOptions) {
  const runtime: RuntimeEnv = opts.runtime ?? {
    log: console.log,
    error: console.error,
    exit: (code: number): never => {
      throw new Error(`exit ${code}`);
    },
  };
  const cfg = opts.config ?? loadConfig();
  const account = resolveTelegramAccount({
    cfg,
    accountId: opts.accountId,
  });
  const telegramCfg = account.config;

  const fetchImpl = resolveTelegramFetch(opts.proxyFetch);
  const isBun = "Bun" in globalThis || Boolean(process?.versions?.bun);
  const shouldProvideFetch = Boolean(opts.proxyFetch) || isBun;
  const timeoutSeconds =
    typeof telegramCfg?.timeoutSeconds === "number" && Number.isFinite(telegramCfg.timeoutSeconds)
      ? Math.max(1, Math.floor(telegramCfg.timeoutSeconds))
      : undefined;
  const client: ApiClientOptions | undefined =
    shouldProvideFetch || timeoutSeconds
      ? {
          ...(shouldProvideFetch && fetchImpl
            ? { fetch: fetchImpl as unknown as ApiClientOptions["fetch"] }
            : {}),
          ...(timeoutSeconds ? { timeoutSeconds } : {}),
        }
      : undefined;

  const bot = new Bot(opts.token, client ? { client } : undefined);
  bot.api.config.use(apiThrottler());
  bot.use(sequentialize(getTelegramSequentialKey));

  const recentUpdates = createTelegramUpdateDedupe();
  let lastUpdateId =
    typeof opts.updateOffset?.lastUpdateId === "number" ? opts.updateOffset.lastUpdateId : null;

  const recordUpdateId = (ctx: TelegramUpdateKeyContext) => {
    const updateId = resolveTelegramUpdateId(ctx);
    if (typeof updateId !== "number") return;
    if (lastUpdateId !== null && updateId <= lastUpdateId) return;
    lastUpdateId = updateId;
    void opts.updateOffset?.onUpdateId?.(updateId);
  };

  const shouldSkipUpdate = (ctx: TelegramUpdateKeyContext) => {
    const updateId = resolveTelegramUpdateId(ctx);
    if (typeof updateId === "number" && lastUpdateId !== null) {
      if (updateId <= lastUpdateId) return true;
    }
    const key = buildTelegramUpdateKey(ctx);
    const skipped = recentUpdates.check(key);
    if (skipped && key && shouldLogVerbose()) {
      logVerbose(`telegram dedupe: skipped ${key}`);
    }
    return skipped;
  };

  bot.use(async (ctx, next) => {
    await next();
    recordUpdateId(ctx);
  });

  const historyLimit = Math.max(
    0,
    telegramCfg.historyLimit ??
      cfg.messages?.groupChat?.historyLimit ??
      DEFAULT_GROUP_HISTORY_LIMIT,
  );
  const groupHistories = new Map<string, HistoryEntry[]>();
  const textLimit = resolveTextChunkLimit(cfg, "telegram", account.accountId);
  const dmPolicy = telegramCfg.dmPolicy ?? "pairing";
  const allowFrom = opts.allowFrom ?? telegramCfg.allowFrom;
  const groupAllowFrom =
    opts.groupAllowFrom ??
    telegramCfg.groupAllowFrom ??
    (telegramCfg.allowFrom && telegramCfg.allowFrom.length > 0
      ? telegramCfg.allowFrom
      : undefined) ??
    (opts.allowFrom && opts.allowFrom.length > 0 ? opts.allowFrom : undefined);
  const replyToMode = opts.replyToMode ?? telegramCfg.replyToMode ?? "first";
  const streamMode = resolveTelegramStreamMode(telegramCfg);
  const nativeEnabled = resolveNativeCommandsEnabled({
    providerId: "telegram",
    providerSetting: telegramCfg.commands?.native,
    globalSetting: cfg.commands?.native,
  });
  const nativeDisabledExplicit = isNativeCommandsExplicitlyDisabled({
    providerSetting: telegramCfg.commands?.native,
    globalSetting: cfg.commands?.native,
  });
  const useAccessGroups = cfg.commands?.useAccessGroups !== false;
  const ackReactionScope = cfg.messages?.ackReactionScope ?? "group-mentions";
  const mediaMaxBytes = (opts.mediaMaxMb ?? telegramCfg.mediaMaxMb ?? 5) * 1024 * 1024;
  const logger = getChildLogger({ module: "telegram-auto-reply" });
  let botHasTopicsEnabled: boolean | undefined;
  const resolveBotTopicsEnabled = async (ctx?: TelegramContext) => {
    const fromCtx = ctx?.me as { has_topics_enabled?: boolean } | undefined;
    if (typeof fromCtx?.has_topics_enabled === "boolean") {
      botHasTopicsEnabled = fromCtx.has_topics_enabled;
      return botHasTopicsEnabled;
    }
    if (typeof botHasTopicsEnabled === "boolean") return botHasTopicsEnabled;
    try {
      const me = (await bot.api.getMe()) as { has_topics_enabled?: boolean };
      botHasTopicsEnabled = Boolean(me?.has_topics_enabled);
    } catch (err) {
      logVerbose(`telegram getMe failed: ${String(err)}`);
      botHasTopicsEnabled = false;
    }
    return botHasTopicsEnabled;
  };
  const resolveGroupPolicy = (chatId: string | number) =>
    resolveChannelGroupPolicy({
      cfg,
      channel: "telegram",
      accountId: account.accountId,
      groupId: String(chatId),
    });
  const resolveGroupActivation = (params: {
    chatId: string | number;
    agentId?: string;
    messageThreadId?: number;
    sessionKey?: string;
  }) => {
    const agentId = params.agentId ?? resolveDefaultAgentId(cfg);
    const sessionKey =
      params.sessionKey ??
      `agent:${agentId}:telegram:group:${buildTelegramGroupPeerId(params.chatId, params.messageThreadId)}`;
    const storePath = resolveStorePath(cfg.session?.store, { agentId });
    try {
      const store = loadSessionStore(storePath);
      const entry = store[sessionKey];
      if (entry?.groupActivation === "always") return false;
      if (entry?.groupActivation === "mention") return true;
    } catch (err) {
      logVerbose(`Failed to load session for activation check: ${String(err)}`);
    }
    return undefined;
  };
  const resolveGroupRequireMention = (chatId: string | number) =>
    resolveChannelGroupRequireMention({
      cfg,
      channel: "telegram",
      accountId: account.accountId,
      groupId: String(chatId),
      requireMentionOverride: opts.requireMention,
      overrideOrder: "after-config",
    });
  const resolveTelegramGroupConfig = (chatId: string | number, messageThreadId?: number) => {
    const groups = telegramCfg.groups;
    if (!groups) return { groupConfig: undefined, topicConfig: undefined };
    const groupKey = String(chatId);
    const groupConfig = groups[groupKey] ?? groups["*"];
    const topicConfig =
      messageThreadId != null ? groupConfig?.topics?.[String(messageThreadId)] : undefined;
    return { groupConfig, topicConfig };
  };

  const processMessage = createTelegramMessageProcessor({
    bot,
    cfg,
    account,
    telegramCfg,
    historyLimit,
    groupHistories,
    dmPolicy,
    allowFrom,
    groupAllowFrom,
    ackReactionScope,
    logger,
    resolveGroupActivation,
    resolveGroupRequireMention,
    resolveTelegramGroupConfig,
    runtime,
    replyToMode,
    streamMode,
    textLimit,
    opts,
    resolveBotTopicsEnabled,
  });

  registerTelegramNativeCommands({
    bot,
    cfg,
    runtime,
    accountId: account.accountId,
    telegramCfg,
    allowFrom,
    groupAllowFrom,
    replyToMode,
    textLimit,
    useAccessGroups,
    nativeEnabled,
    nativeDisabledExplicit,
    resolveGroupPolicy,
    resolveTelegramGroupConfig,
    shouldSkipUpdate,
    opts,
  });

  registerTelegramHandlers({
    bot,
    opts,
    runtime,
    mediaMaxBytes,
    telegramCfg,
    groupAllowFrom,
    resolveGroupPolicy,
    resolveTelegramGroupConfig,
    shouldSkipUpdate,
    processMessage,
    logger,
  });

  return bot;
}

export function createTelegramWebhookCallback(bot: Bot, path = "/telegram-webhook") {
  return { path, handler: webhookCallback(bot, "http") };
}